title: Tumor-associated antigen immune complexes. A potential marker of recurrent melanoma.
abstract: To determine the potential utility of antigen-specific immune complex analysis, we developed a competitive enzyme-linked immunosorbent assay utilizing polyclonal human antibody to detect tumor-associated antigen-specific immune complexes. Sera from 10 normal volunteers and 19 patients with recurrent melanoma were studied. Patients with recurrent melanoma had a mean +/- SD percent inhibition of 27.6% +/- 29.8% in contrast to normal individuals with a mean value of 8.4% +/- 17.8%. A monoclonal antibody (MAb JSI) was developed following immunization with a partially purified antigen. Utilizing MAb JSI, we developed a "sandwich" enzyme-linked immunosorbent assay and studied sera from 45 normal volunteers and 44 patients with cancer with recurrent melanoma. Results were expressed as a percent maximum binding of a positive control. The mean +/- SD percent maximum binding for normal subjects was 4.9% +/- 7.7% in contrast to sera from patients with melanoma who had a mean of 38.3% +/- 33.3%. Serial analysis of four patients with melanoma with tumor-associated antigen-specific immune complexes demonstrated the presence of tumor-associated antigen-specific immune complexes up to 12 years prior to clinical recurrence.
authors.affiliation: John Wayne Cancer Clinic, Armand Hammer Laboratories, Jonsson Comprehensive Cancer Center, UCLA School of Medicine 90024.
authors.forename: J H
authors.initials: JH
authors.lastname: Wong
authors.forename: S H
authors.initials: SH
authors.lastname: Xu
authors.forename: R K
authors.initials: RK
authors.lastname: Gupta
authors.forename: D L
authors.initials: DL
authors.lastname: Morton
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex / Q000032:analysis*; D000951:Antigens, Neoplasm / Q000032:analysis*; D001667:Binding, Competitive; D014408:Biomarkers, Tumor / Q000032:analysis*; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D005326:Fetal Proteins / Q000032:analysis; D006801:Humans; D008297:Male; D008545:Melanoma / Q000032:analysis / Q000276:immunology*; D009364:Neoplasm Recurrence, Local
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D005326:Fetal Proteins; C036269:tumor-associated fetal antigen, rat